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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d1fb93643b356cb775f9f96c89244bd0c915492bd7944b88bfbf6203c484ce1' 
  AND token = 'ISQ5bh4YpiXDVLCK0aQW2KR9ej36w7Bc0J8g+5c++J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}